Surface Modification Effects on CNTs Adsorption of Methylene Blue and Phenol

Table 10

Comparison of the first-order, second-order, and intraparticle diffusion rate constants values for phenol adsorption on CNT-A-HM at different initial concentration.

(a)

𝐶0 (mmol/L)	Pseudo-first-order kinetic
	𝑞𝑒,exp (mmol/kg)	𝑞𝑒,calc (mmol/kg)	𝑘1 (min^−1)	𝑅^2
0.0531	38.22	19.64	0.0115	0.7450
0.2656	54.49	24.64	0.0023	0.4109
0.5313	66.45	34.68	0.0026	0.5477

(b)

𝐶0 (mmol/L)	Pseudo-second-order kinetic
	𝑞𝑒,exp (mmol/kg)	𝑞𝑒,calc (mmol/kg)	𝑘2 (kg/mmol · min)	𝑅^2	ℎ (mg/g · min)
0.0531	38.22	42.23	0.002136	0.9981	3.8062
0.2656	54.49	47.35	0.001346	0.9540	3.0209
0.5313	69.32	57.13	0.000932	0.9470	3.0624

(c)

𝐶0 (mmol/L)	Intraparticle diffusion
	𝑘𝑖 (mmol/kg/min^0.5)	𝐶𝑖 (mmol/kg)	𝑅^2
0.0531	1.642	15.652	0.7029
0.2656	1.491	21.517	0.5564
0.5313	2.017	21.783	0.6751